mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
802 lines
23 KiB
C++
802 lines
23 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Component that can generate various useful Yul functions.
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*/
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#include <libsolidity/codegen/YulUtilFunctions.h>
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#include <libsolidity/codegen/MultiUseYulFunctionCollector.h>
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#include <libsolidity/ast/AST.h>
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#include <libsolidity/codegen/CompilerUtils.h>
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#include <libdevcore/Whiskers.h>
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#include <boost/algorithm/string/join.hpp>
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#include <boost/range/adaptor/reversed.hpp>
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using namespace std;
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using namespace dev;
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using namespace dev::solidity;
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string YulUtilFunctions::combineExternalFunctionIdFunction()
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{
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string functionName = "combine_external_function_id";
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return m_functionCollector->createFunction(functionName, [&]() {
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return Whiskers(R"(
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function <functionName>(addr, selector) -> combined {
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combined := <shl64>(or(<shl32>(addr), and(selector, 0xffffffff)))
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}
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)")
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("functionName", functionName)
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("shl32", shiftLeftFunction(32))
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("shl64", shiftLeftFunction(64))
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.render();
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});
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}
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string YulUtilFunctions::splitExternalFunctionIdFunction()
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{
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string functionName = "split_external_function_id";
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return m_functionCollector->createFunction(functionName, [&]() {
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return Whiskers(R"(
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function <functionName>(combined) -> addr, selector {
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combined := <shr64>(combined)
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selector := and(combined, 0xffffffff)
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addr := <shr32>(combined)
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}
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)")
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("functionName", functionName)
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("shr32", shiftRightFunction(32))
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("shr64", shiftRightFunction(64))
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.render();
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});
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}
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string YulUtilFunctions::copyToMemoryFunction(bool _fromCalldata)
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{
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string functionName = "copy_" + string(_fromCalldata ? "calldata" : "memory") + "_to_memory";
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return m_functionCollector->createFunction(functionName, [&]() {
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if (_fromCalldata)
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{
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return Whiskers(R"(
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function <functionName>(src, dst, length) {
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calldatacopy(dst, src, length)
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// clear end
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mstore(add(dst, length), 0)
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}
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)")
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("functionName", functionName)
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.render();
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}
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else
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{
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return Whiskers(R"(
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function <functionName>(src, dst, length) {
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let i := 0
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for { } lt(i, length) { i := add(i, 32) }
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{
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mstore(add(dst, i), mload(add(src, i)))
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}
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if gt(i, length)
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{
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// clear end
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mstore(add(dst, length), 0)
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}
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}
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)")
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("functionName", functionName)
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.render();
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}
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});
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}
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string YulUtilFunctions::leftAlignFunction(Type const& _type)
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{
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string functionName = string("leftAlign_") + _type.identifier();
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return m_functionCollector->createFunction(functionName, [&]() {
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Whiskers templ(R"(
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function <functionName>(value) -> aligned {
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<body>
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}
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)");
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templ("functionName", functionName);
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switch (_type.category())
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{
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case Type::Category::Address:
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templ("body", "aligned := " + leftAlignFunction(IntegerType(160)) + "(value)");
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break;
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case Type::Category::Integer:
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{
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IntegerType const& type = dynamic_cast<IntegerType const&>(_type);
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if (type.numBits() == 256)
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templ("body", "aligned := value");
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else
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templ("body", "aligned := " + shiftLeftFunction(256 - type.numBits()) + "(value)");
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break;
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}
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case Type::Category::RationalNumber:
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solAssert(false, "Left align requested for rational number.");
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break;
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case Type::Category::Bool:
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templ("body", "aligned := " + leftAlignFunction(IntegerType(8)) + "(value)");
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break;
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case Type::Category::FixedPoint:
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solUnimplemented("Fixed point types not implemented.");
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break;
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case Type::Category::Array:
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case Type::Category::Struct:
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solAssert(false, "Left align requested for non-value type.");
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break;
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case Type::Category::FixedBytes:
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templ("body", "aligned := value");
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break;
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case Type::Category::Contract:
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templ("body", "aligned := " + leftAlignFunction(*TypeProvider::address()) + "(value)");
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break;
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case Type::Category::Enum:
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{
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unsigned storageBytes = dynamic_cast<EnumType const&>(_type).storageBytes();
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templ("body", "aligned := " + leftAlignFunction(IntegerType(8 * storageBytes)) + "(value)");
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break;
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}
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case Type::Category::InaccessibleDynamic:
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solAssert(false, "Left align requested for inaccessible dynamic type.");
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break;
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default:
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solAssert(false, "Left align of type " + _type.identifier() + " requested.");
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}
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return templ.render();
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});
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}
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string YulUtilFunctions::shiftLeftFunction(size_t _numBits)
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{
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solAssert(_numBits < 256, "");
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string functionName = "shift_left_" + to_string(_numBits);
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if (m_evmVersion.hasBitwiseShifting())
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{
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return m_functionCollector->createFunction(functionName, [&]() {
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return
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Whiskers(R"(
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function <functionName>(value) -> newValue {
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newValue := shl(<numBits>, value)
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}
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)")
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("functionName", functionName)
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("numBits", to_string(_numBits))
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.render();
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});
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}
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else
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{
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return m_functionCollector->createFunction(functionName, [&]() {
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return
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Whiskers(R"(
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function <functionName>(value) -> newValue {
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newValue := mul(value, <multiplier>)
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}
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)")
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("functionName", functionName)
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("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
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.render();
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});
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}
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}
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string YulUtilFunctions::shiftRightFunction(size_t _numBits)
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{
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solAssert(_numBits < 256, "");
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// Note that if this is extended with signed shifts,
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// the opcodes SAR and SDIV behave differently with regards to rounding!
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string functionName = "shift_right_" + to_string(_numBits) + "_unsigned";
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if (m_evmVersion.hasBitwiseShifting())
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{
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return m_functionCollector->createFunction(functionName, [&]() {
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return
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Whiskers(R"(
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function <functionName>(value) -> newValue {
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newValue := shr(<numBits>, value)
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}
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)")
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("functionName", functionName)
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("numBits", to_string(_numBits))
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.render();
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});
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}
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else
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{
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return m_functionCollector->createFunction(functionName, [&]() {
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return
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Whiskers(R"(
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function <functionName>(value) -> newValue {
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newValue := div(value, <multiplier>)
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}
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)")
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("functionName", functionName)
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("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
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.render();
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});
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}
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}
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string YulUtilFunctions::roundUpFunction()
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{
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string functionName = "round_up_to_mul_of_32";
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return m_functionCollector->createFunction(functionName, [&]() {
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return
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Whiskers(R"(
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function <functionName>(value) -> result {
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result := and(add(value, 31), not(31))
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}
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)")
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("functionName", functionName)
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.render();
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});
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}
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string YulUtilFunctions::overflowCheckedUIntAddFunction(size_t _bits)
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{
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solAssert(0 < _bits && _bits <= 256 && _bits % 8 == 0, "");
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string functionName = "checked_add_uint_" + to_string(_bits);
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return m_functionCollector->createFunction(functionName, [&]() {
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if (_bits < 256)
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return
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Whiskers(R"(
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function <functionName>(x, y) -> sum {
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let mask := <mask>
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sum := add(and(x, mask), and(y, mask))
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if and(sum, not(mask)) { revert(0, 0) }
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}
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)")
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("functionName", functionName)
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("mask", toCompactHexWithPrefix((u256(1) << _bits) - 1))
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.render();
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else
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return
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Whiskers(R"(
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function <functionName>(x, y) -> sum {
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sum := add(x, y)
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if lt(sum, x) { revert(0, 0) }
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}
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)")
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("functionName", functionName)
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.render();
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});
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}
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string YulUtilFunctions::arrayLengthFunction(ArrayType const& _type)
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{
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string functionName = "array_length_" + _type.identifier();
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return m_functionCollector->createFunction(functionName, [&]() {
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Whiskers w(R"(
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function <functionName>(value) -> length {
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<body>
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}
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)");
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w("functionName", functionName);
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string body;
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if (!_type.isDynamicallySized())
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body = "length := " + toCompactHexWithPrefix(_type.length());
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else
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{
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switch (_type.location())
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{
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case DataLocation::CallData:
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solAssert(false, "called regular array length function on calldata array");
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break;
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case DataLocation::Memory:
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body = "length := mload(value)";
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break;
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case DataLocation::Storage:
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if (_type.isByteArray())
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{
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// Retrieve length both for in-place strings and off-place strings:
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// Computes (x & (0x100 * (ISZERO (x & 1)) - 1)) / 2
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// i.e. for short strings (x & 1 == 0) it does (x & 0xff) / 2 and for long strings it
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// computes (x & (-1)) / 2, which is equivalent to just x / 2.
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body = R"(
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length := sload(value)
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let mask := sub(mul(0x100, iszero(and(length, 1))), 1)
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length := div(and(length, mask), 2)
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)";
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}
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else
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body = "length := sload(value)";
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break;
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}
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}
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solAssert(!body.empty(), "");
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w("body", body);
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return w.render();
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});
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}
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string YulUtilFunctions::arrayAllocationSizeFunction(ArrayType const& _type)
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{
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solAssert(_type.dataStoredIn(DataLocation::Memory), "");
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string functionName = "array_allocation_size_" + _type.identifier();
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return m_functionCollector->createFunction(functionName, [&]() {
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Whiskers w(R"(
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function <functionName>(length) -> size {
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// Make sure we can allocate memory without overflow
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if gt(length, 0xffffffffffffffff) { revert(0, 0) }
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size := <allocationSize>
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<addLengthSlot>
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}
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)");
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w("functionName", functionName);
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if (_type.isByteArray())
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// Round up
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w("allocationSize", "and(add(length, 0x1f), not(0x1f))");
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else
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w("allocationSize", "mul(length, 0x20)");
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if (_type.isDynamicallySized())
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w("addLengthSlot", "size := add(size, 0x20)");
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else
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w("addLengthSlot", "");
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return w.render();
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});
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}
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string YulUtilFunctions::arrayDataAreaFunction(ArrayType const& _type)
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{
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string functionName = "array_dataslot_" + _type.identifier();
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return m_functionCollector->createFunction(functionName, [&]() {
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switch (_type.location())
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{
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case DataLocation::Memory:
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if (_type.isDynamicallySized())
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return Whiskers(R"(
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function <functionName>(memPtr) -> dataPtr {
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dataPtr := add(memPtr, 0x20)
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}
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)")
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("functionName", functionName)
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.render();
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else
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return Whiskers(R"(
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function <functionName>(memPtr) -> dataPtr {
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dataPtr := memPtr
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}
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)")
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("functionName", functionName)
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.render();
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case DataLocation::Storage:
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if (_type.isDynamicallySized())
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{
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Whiskers w(R"(
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function <functionName>(slot) -> dataSlot {
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mstore(0, slot)
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dataSlot := keccak256(0, 0x20)
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}
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)");
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w("functionName", functionName);
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return w.render();
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}
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else
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{
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Whiskers w(R"(
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function <functionName>(slot) -> dataSlot {
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dataSlot := slot
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}
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)");
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w("functionName", functionName);
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return w.render();
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}
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case DataLocation::CallData:
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{
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// Calldata arrays are stored as offset of the data area and length
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// on the stack, so the offset already points to the data area.
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// This might change, if calldata arrays are stored in a single
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// stack slot at some point.
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Whiskers w(R"(
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function <functionName>(slot) -> dataSlot {
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dataSlot := slot
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}
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)");
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w("functionName", functionName);
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return w.render();
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}
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default:
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solAssert(false, "");
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}
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});
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}
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string YulUtilFunctions::nextArrayElementFunction(ArrayType const& _type)
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{
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solAssert(!_type.isByteArray(), "");
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if (_type.dataStoredIn(DataLocation::Storage))
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solAssert(_type.baseType()->storageBytes() > 16, "");
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string functionName = "array_nextElement_" + _type.identifier();
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return m_functionCollector->createFunction(functionName, [&]() {
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switch (_type.location())
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{
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case DataLocation::Memory:
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return Whiskers(R"(
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function <functionName>(memPtr) -> nextPtr {
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nextPtr := add(memPtr, 0x20)
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}
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)")
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("functionName", functionName)
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.render();
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case DataLocation::Storage:
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return Whiskers(R"(
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function <functionName>(slot) -> nextSlot {
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nextSlot := add(slot, 1)
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}
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)")
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("functionName", functionName)
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.render();
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case DataLocation::CallData:
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return Whiskers(R"(
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function <functionName>(calldataPtr) -> nextPtr {
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nextPtr := add(calldataPtr, <stride>)
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}
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)")
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("stride", toCompactHexWithPrefix(_type.baseType()->isDynamicallyEncoded() ? 32 : _type.baseType()->calldataEncodedSize()))
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("functionName", functionName)
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.render();
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default:
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solAssert(false, "");
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}
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});
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}
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string YulUtilFunctions::allocationFunction()
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{
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string functionName = "allocateMemory";
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return m_functionCollector->createFunction(functionName, [&]() {
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return Whiskers(R"(
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function <functionName>(size) -> memPtr {
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memPtr := mload(<freeMemoryPointer>)
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let newFreePtr := add(memPtr, size)
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// protect against overflow
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if or(gt(newFreePtr, 0xffffffffffffffff), lt(newFreePtr, memPtr)) { revert(0, 0) }
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mstore(<freeMemoryPointer>, newFreePtr)
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}
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)")
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("freeMemoryPointer", to_string(CompilerUtils::freeMemoryPointer))
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("functionName", functionName)
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.render();
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});
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}
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string YulUtilFunctions::conversionFunction(Type const& _from, Type const& _to)
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{
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string functionName =
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"convert_" +
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_from.identifier() +
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"_to_" +
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_to.identifier();
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return m_functionCollector->createFunction(functionName, [&]() {
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Whiskers templ(R"(
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function <functionName>(value) -> converted {
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<body>
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}
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)");
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templ("functionName", functionName);
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string body;
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auto toCategory = _to.category();
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auto fromCategory = _from.category();
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switch (fromCategory)
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{
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case Type::Category::Address:
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body =
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Whiskers("converted := <convert>(value)")
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("convert", conversionFunction(IntegerType(160), _to))
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.render();
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break;
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case Type::Category::Integer:
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case Type::Category::RationalNumber:
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case Type::Category::Contract:
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{
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if (RationalNumberType const* rational = dynamic_cast<RationalNumberType const*>(&_from))
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solUnimplementedAssert(!rational->isFractional(), "Not yet implemented - FixedPointType.");
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if (toCategory == Type::Category::FixedBytes)
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{
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solAssert(
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fromCategory == Type::Category::Integer || fromCategory == Type::Category::RationalNumber,
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"Invalid conversion to FixedBytesType requested."
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);
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FixedBytesType const& toBytesType = dynamic_cast<FixedBytesType const&>(_to);
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body =
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Whiskers("converted := <shiftLeft>(<clean>(value))")
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("shiftLeft", shiftLeftFunction(256 - toBytesType.numBytes() * 8))
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("clean", cleanupFunction(_from))
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.render();
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}
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else if (toCategory == Type::Category::Enum)
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{
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solAssert(_from.mobileType(), "");
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body =
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Whiskers("converted := <cleanEnum>(<cleanInt>(value))")
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("cleanEnum", cleanupFunction(_to))
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// "mobileType()" returns integer type for rational
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("cleanInt", cleanupFunction(*_from.mobileType()))
|
|
.render();
|
|
}
|
|
else if (toCategory == Type::Category::FixedPoint)
|
|
solUnimplemented("Not yet implemented - FixedPointType.");
|
|
else if (toCategory == Type::Category::Address)
|
|
body =
|
|
Whiskers("converted := <convert>(value)")
|
|
("convert", conversionFunction(_from, IntegerType(160)))
|
|
.render();
|
|
else
|
|
{
|
|
solAssert(
|
|
toCategory == Type::Category::Integer ||
|
|
toCategory == Type::Category::Contract,
|
|
"");
|
|
IntegerType const addressType(160);
|
|
IntegerType const& to =
|
|
toCategory == Type::Category::Integer ?
|
|
dynamic_cast<IntegerType const&>(_to) :
|
|
addressType;
|
|
|
|
// Clean according to the "to" type, except if this is
|
|
// a widening conversion.
|
|
IntegerType const* cleanupType = &to;
|
|
if (fromCategory != Type::Category::RationalNumber)
|
|
{
|
|
IntegerType const& from =
|
|
fromCategory == Type::Category::Integer ?
|
|
dynamic_cast<IntegerType const&>(_from) :
|
|
addressType;
|
|
if (to.numBits() > from.numBits())
|
|
cleanupType = &from;
|
|
}
|
|
body =
|
|
Whiskers("converted := <cleanInt>(value)")
|
|
("cleanInt", cleanupFunction(*cleanupType))
|
|
.render();
|
|
}
|
|
break;
|
|
}
|
|
case Type::Category::Bool:
|
|
{
|
|
solAssert(_from == _to, "Invalid conversion for bool.");
|
|
body =
|
|
Whiskers("converted := <clean>(value)")
|
|
("clean", cleanupFunction(_from))
|
|
.render();
|
|
break;
|
|
}
|
|
case Type::Category::FixedPoint:
|
|
solUnimplemented("Fixed point types not implemented.");
|
|
break;
|
|
case Type::Category::Array:
|
|
solUnimplementedAssert(false, "Array conversion not implemented.");
|
|
break;
|
|
case Type::Category::Struct:
|
|
solUnimplementedAssert(false, "Struct conversion not implemented.");
|
|
break;
|
|
case Type::Category::FixedBytes:
|
|
{
|
|
FixedBytesType const& from = dynamic_cast<FixedBytesType const&>(_from);
|
|
if (toCategory == Type::Category::Integer)
|
|
body =
|
|
Whiskers("converted := <convert>(<shift>(value))")
|
|
("shift", shiftRightFunction(256 - from.numBytes() * 8))
|
|
("convert", conversionFunction(IntegerType(from.numBytes() * 8), _to))
|
|
.render();
|
|
else if (toCategory == Type::Category::Address)
|
|
body =
|
|
Whiskers("converted := <convert>(value)")
|
|
("convert", conversionFunction(_from, IntegerType(160)))
|
|
.render();
|
|
else
|
|
{
|
|
// clear for conversion to longer bytes
|
|
solAssert(toCategory == Type::Category::FixedBytes, "Invalid type conversion requested.");
|
|
body =
|
|
Whiskers("converted := <clean>(value)")
|
|
("clean", cleanupFunction(from))
|
|
.render();
|
|
}
|
|
break;
|
|
}
|
|
case Type::Category::Function:
|
|
{
|
|
solAssert(false, "Conversion should not be called for function types.");
|
|
break;
|
|
}
|
|
case Type::Category::Enum:
|
|
{
|
|
solAssert(toCategory == Type::Category::Integer || _from == _to, "");
|
|
EnumType const& enumType = dynamic_cast<decltype(enumType)>(_from);
|
|
body =
|
|
Whiskers("converted := <clean>(value)")
|
|
("clean", cleanupFunction(enumType))
|
|
.render();
|
|
break;
|
|
}
|
|
case Type::Category::Tuple:
|
|
{
|
|
solUnimplementedAssert(false, "Tuple conversion not implemented.");
|
|
break;
|
|
}
|
|
default:
|
|
solAssert(false, "");
|
|
}
|
|
|
|
solAssert(!body.empty(), _from.canonicalName() + " to " + _to.canonicalName());
|
|
templ("body", body);
|
|
return templ.render();
|
|
});
|
|
}
|
|
|
|
string YulUtilFunctions::cleanupFunction(Type const& _type)
|
|
{
|
|
string functionName = string("cleanup_") + _type.identifier();
|
|
return m_functionCollector->createFunction(functionName, [&]() {
|
|
Whiskers templ(R"(
|
|
function <functionName>(value) -> cleaned {
|
|
<body>
|
|
}
|
|
)");
|
|
templ("functionName", functionName);
|
|
switch (_type.category())
|
|
{
|
|
case Type::Category::Address:
|
|
templ("body", "cleaned := " + cleanupFunction(IntegerType(160)) + "(value)");
|
|
break;
|
|
case Type::Category::Integer:
|
|
{
|
|
IntegerType const& type = dynamic_cast<IntegerType const&>(_type);
|
|
if (type.numBits() == 256)
|
|
templ("body", "cleaned := value");
|
|
else if (type.isSigned())
|
|
templ("body", "cleaned := signextend(" + to_string(type.numBits() / 8 - 1) + ", value)");
|
|
else
|
|
templ("body", "cleaned := and(value, " + toCompactHexWithPrefix((u256(1) << type.numBits()) - 1) + ")");
|
|
break;
|
|
}
|
|
case Type::Category::RationalNumber:
|
|
templ("body", "cleaned := value");
|
|
break;
|
|
case Type::Category::Bool:
|
|
templ("body", "cleaned := iszero(iszero(value))");
|
|
break;
|
|
case Type::Category::FixedPoint:
|
|
solUnimplemented("Fixed point types not implemented.");
|
|
break;
|
|
case Type::Category::Function:
|
|
solAssert(dynamic_cast<FunctionType const&>(_type).kind() == FunctionType::Kind::External, "");
|
|
templ("body", "cleaned := " + cleanupFunction(FixedBytesType(24)) + "(value)");
|
|
break;
|
|
case Type::Category::Array:
|
|
case Type::Category::Struct:
|
|
case Type::Category::Mapping:
|
|
solAssert(_type.dataStoredIn(DataLocation::Storage), "Cleanup requested for non-storage reference type.");
|
|
templ("body", "cleaned := value");
|
|
break;
|
|
case Type::Category::FixedBytes:
|
|
{
|
|
FixedBytesType const& type = dynamic_cast<FixedBytesType const&>(_type);
|
|
if (type.numBytes() == 32)
|
|
templ("body", "cleaned := value");
|
|
else if (type.numBytes() == 0)
|
|
// This is disallowed in the type system.
|
|
solAssert(false, "");
|
|
else
|
|
{
|
|
size_t numBits = type.numBytes() * 8;
|
|
u256 mask = ((u256(1) << numBits) - 1) << (256 - numBits);
|
|
templ("body", "cleaned := and(value, " + toCompactHexWithPrefix(mask) + ")");
|
|
}
|
|
break;
|
|
}
|
|
case Type::Category::Contract:
|
|
{
|
|
AddressType addressType(dynamic_cast<ContractType const&>(_type).isPayable() ?
|
|
StateMutability::Payable :
|
|
StateMutability::NonPayable
|
|
);
|
|
templ("body", "cleaned := " + cleanupFunction(addressType) + "(value)");
|
|
break;
|
|
}
|
|
case Type::Category::Enum:
|
|
{
|
|
// Out of range enums cannot be truncated unambigiously and therefore it should be an error.
|
|
templ("body", "cleaned := value " + validatorFunction(_type) + "(value)");
|
|
break;
|
|
}
|
|
case Type::Category::InaccessibleDynamic:
|
|
templ("body", "cleaned := 0");
|
|
break;
|
|
default:
|
|
solAssert(false, "Cleanup of type " + _type.identifier() + " requested.");
|
|
}
|
|
|
|
return templ.render();
|
|
});
|
|
}
|
|
|
|
string YulUtilFunctions::validatorFunction(Type const& _type, bool _revertOnFailure)
|
|
{
|
|
string functionName = string("validator_") + (_revertOnFailure ? "revert_" : "assert_") + _type.identifier();
|
|
return m_functionCollector->createFunction(functionName, [&]() {
|
|
Whiskers templ(R"(
|
|
function <functionName>(value) {
|
|
if iszero(<condition>) { <failure> }
|
|
}
|
|
)");
|
|
templ("functionName", functionName);
|
|
if (_revertOnFailure)
|
|
templ("failure", "revert(0, 0)");
|
|
else
|
|
templ("failure", "invalid()");
|
|
|
|
switch (_type.category())
|
|
{
|
|
case Type::Category::Address:
|
|
case Type::Category::Integer:
|
|
case Type::Category::RationalNumber:
|
|
case Type::Category::Bool:
|
|
case Type::Category::FixedPoint:
|
|
case Type::Category::Function:
|
|
case Type::Category::Array:
|
|
case Type::Category::Struct:
|
|
case Type::Category::Mapping:
|
|
case Type::Category::FixedBytes:
|
|
case Type::Category::Contract:
|
|
{
|
|
templ("condition", "eq(value, " + cleanupFunction(_type) + "(value))");
|
|
break;
|
|
}
|
|
case Type::Category::Enum:
|
|
{
|
|
size_t members = dynamic_cast<EnumType const&>(_type).numberOfMembers();
|
|
solAssert(members > 0, "empty enum should have caused a parser error.");
|
|
templ("condition", "lt(value, " + to_string(members) + ")");
|
|
break;
|
|
}
|
|
case Type::Category::InaccessibleDynamic:
|
|
templ("condition", "1");
|
|
break;
|
|
default:
|
|
solAssert(false, "Validation of type " + _type.identifier() + " requested.");
|
|
}
|
|
|
|
return templ.render();
|
|
});
|
|
}
|
|
|
|
string YulUtilFunctions::suffixedVariableNameList(string const& _baseName, size_t _startSuffix, size_t _endSuffix)
|
|
{
|
|
string result;
|
|
if (_startSuffix < _endSuffix)
|
|
{
|
|
result = _baseName + to_string(_startSuffix++);
|
|
while (_startSuffix < _endSuffix)
|
|
result += ", " + _baseName + to_string(_startSuffix++);
|
|
}
|
|
else if (_endSuffix < _startSuffix)
|
|
{
|
|
result = _baseName + to_string(_endSuffix++);
|
|
while (_endSuffix < _startSuffix)
|
|
result = _baseName + to_string(_endSuffix++) + ", " + result;
|
|
}
|
|
return result;
|
|
}
|